summary.twinspan: Summary of twinspan Classification

In jarioksa/twinspan: Two-Way Indicator Species Analysis

Summary of twinspan Classification

Description

The function gives a compact summary of divisions with indicator species and items in final classification. The output gives the same essential information as the printed output of TWINSPAN batch program, but in more compact form.

Usage

## S3 method for class 'twinspan'
summary(object, what = c("quadrat", "species"), binname = FALSE, maxitems, ...)

Arguments

object	twinspan result object.
what	Summarize either quadrat or species classification.
binname	Use binary labels for divisions instead of decimal numbers.
maxitems	Maximum number of items (members) listed for terminal groups.
...	Other arguments (ignored).

Details

For each division, summary prints the eigenvalue. For quadrat divisions, it also prints the indicator pseudospecies with their signs, followed by < and the lowest indicator score for the ‘positive’ (right) group. If the indicator score is below this value, follow the summary to the next item at the lower level, and if the indicator score is at the limit or higher, follow to the second alternative. For division number k, the next items are either 2k (‘negative’ group) or 2k+1 (‘positive’ group). Function plot.twinspan displays the division numbers in a classification tree.

For terminal groups, the function gives the size of the group and lists its elements (quadrats or species).

Value

The function returns nothing. It only prints the result object in a human-readable way.

See Also

plot.twinspan displays the same structure visually. Function predict.twinspan follows the summary strcture to predict the classification with indicator pseudospecies.

Examples

data(ahti)
tw <- twinspan(ahti)
summary(tw, maxitems = 6)
summary(tw, "species")

jarioksa/twinspan documentation built on Nov. 23, 2024, 2:49 p.m.